身份认证与访问控制是信息系统防御主动攻击的主要安全机制。

Identity authentication and access control are the major security mechanisms to defend active attack.

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为了保障主动网络安全，我们需要两个基本服务，即认证和授权。

In order to secure active networks, we need two basic services: authentication and authorization.

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为了保障主动网络安全，我们需要两个基本服务，即认证和授权。

In order to secure active networks, we need two basic services: authentication and authorization.

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